Swing system for a motor-driven and manually-guided working device



May 21, 1963 H. KEsTEL 3,090,286

SWING SYSTEM FOR A MOTOR-DRIVEN AND MANUALLY-GUIDED WORKING DEVICE Filed Oct. 4, 1960 5 Sheets-Sheet 1 FIG. l. m

1 lll/4 INVENTOR BYz l ATTORNEY.

May 21, 1963 3,090,286

H. KESTEL SWING SYSTEM FOR A MOTOR-DRIVEN AND MANUALLY-GUIDED WORKING DEVICE Filed oct. 4,' 1960 5 Sheets-Sheet 2 lNVENTOR BY E @l ATTORNEY.

May 2l, 1963 Filed Oct. 4, 1960 H. KESTEL SWING SYSTEM FOR A MOTOR-DRIVEN AND MANUALLY-GUIDED WORKING DEVICE 3 Sheets-Sheet 3 FIG. 4.

INVENTOR WML@ ma ATTORNEY.

United States Patent O 3,090,286 SWING SYSTEM FOR A MGTOR-DRIVEN AND MANUALLY-GUIDED WORKING DEVICE Heinrich Kestel, Munich, Germany, assignor to Herman Wacker and Peter Wacker, Munich, Germany Filed Oct. 4, 1960, Ser. No. 60,330 Claims priority, application Germany Oct. 24, 1959 2 Claims. (Cl. 94-49) The present invention relates to a swing system for a motor-driven and manually-guided working device.

There are two different types of such working devices known, wherein the tool performs reciprocating working movements. The driving motor is in these arrangements either rigidly or exchangeably connected with the working device. The power transfer from the driving motor to Ithe swing system is brought about by means of a pinion mounted on the shaft of the driving motor, a gear meshing with the pinion and a crank drive. A connecting rod is operated from the crank drive.

In one of the known embodiments of such working devices, a piston is pivotally connected to the lower end of the connecting rod by means of a pivot bolt, which piston performs in a housing of the working device a reciprocating movement. The piston carries a piston rod on which a beater piston is guided by means of an intermediate arrangement of one or a plurality of springs. The beater piston performs during the reciprocating movement of the piston rod a greater stroke than the latter and hits during one stroke of the working cycle always the tool mounted in the lower part of the housing of the device.

In a second known embodiment of such devices, the connecting rod engages a cylinder which is axially movable in the housing of the device. Inside of this movable cylinder is disposed a piston, which is supported by springs between the end bottoms of the cylinder. The piston is operatively connected with the tool and the latter is exchangeably mounted at the lower end of the device.

The springs disposed above and below the piston are alternately compressed during the reciprocating movement of the piston rod and of the cylinder and impart a reciprocating movement to the piston which is connected with the tool.

It is one object of the present invention to provide a swing system for a motor-driven and manually-guided working device wherein the connecting rod of the crank drive is connected with the piston rod of a guiding piston by means of a pivot bo'lt and wherein the guiding piston slides in a guiding cylinder either rigidly or exchangeably connected with the tool by intermediate arrangement of springs disposed between the guiding piston and the bottom-s of the guiding cylinder, and wherein additionally, the guiding cylinder connected with the tool is axially movable in an outer cylinder forming the housing of the working device.

The present invention brings about the advantage, in comparison with the known beating and swinging system, that a particularly low structure is brought about. The total structure of the swing system can thus be maintained at a low height. Due to the low structure the device is particularly manageable and can be applied particularly also for compressing material in dikes or the like.

Another advantage of the structure of the present invention resides in the possibility of providing an appreciably larger stroke of the tool. By this arrangement a better compression of the material to be compressed is secured. Furthermore, it has been made possible, by the arrangement in accordance with the present invention, to increase appreciably the diameter of the tool,

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for instance of the tamping plate, which again leads to a better stability and, thereby, a safer guidance of the devlce.

It is yet another object of the present invention to provide a swing system for a motor-driven and manuallyguided working device, wherein the guiding cylinder is connected with a tool by means of a clamping ring and one or a plurality of conically or wedge-shaped clamping elements, which are disposed between inter-engaging faces of the guiding cylinder and a sleeve rigidly connected with the tool, respectively. The guiding cylinder and the tool can be also easily exchangeably connected with each other by means of conically inter-engaging bushings.

Between the guiding cylinder and the outer cylinder forming the housing of the working device, particularly dirt-ejecting elements can be interposed.

With these and other objects in view which will become apparent in the following detailed description, the present invention will be clearly understood .in connection with the accompanying drawings, in which:

FIGURE 1 is an axial section of the structure of the swing system for a motor-driven and manually-guided working device, designed in accordance with the present invention;

FIG. 2 is a section along the lines 2 2 of FIG. l;

FIG. 3 is a fragmentary axial section of another embodiment of the lower portion of the device;

FIG. 4 is a section along the lines 4 4 of FIG. 3; and

FIG. 5 is a section along the lines 5--5 of FIG. 4.

Referring now to the drawings, and in particular to FIGS. 1 and 2, the structure comprises a motor 1, the shaft of which car-ries a pinion 1', the latter meshing with a gear 2 operating a crank drive 3 including a connecting rod 1, which constitutes the driving means for the tool 5. The free end of the connecting rod 1 is connected with the free end of a piston rod 2 by means of a pivot bolt 3, the piston rod 2 carrying a piston 2'. The latter `slides in a guiding cylinder 6 which is either integrally or exchangeably connected with the tool 5. Springs 8 and 9 are ldisposed between the two opposite faces of the guiding piston 2 and the corresponding opposite bottom members 6 and 6 of the guiding cylinder `6. The guiding cylinder 6 which carries the tool 5, for instance a tamping plate, slides in the outer cylinder 4 which forms the housing of the working device.

The guiding cylinder 6 is connected with the tool 5 by means of a clamping ring 12.

The bottom portion of the guiding cylinder 6 is surrounded by a sleeve member :11 and pairs of conical or wedge-shaped elements 10 are disposed between the outer face of the guiding cylinder 6 and the inner face of the sleeve member 11. The clamping ring l2 has an outer thread engaging the complementary inner thread of the sleeve member 11. As indicated in FIGS. l and 2, disclosing one embodiment of the present invention, the lower end of the clamping ring 12 abuts the wedge- -shaped elements 10 and exerts a wedge effect on the latter, so that the latter connect by friction the outer face of the gui-ding cylinder 6 and the inner face of the sleeve member 11 and, thereby providing connection of the tool 5 with the guiding cylinder 6.

Referring now to FIGS. 3 and 4 of the drawings, disclosing a second embodiment of the present invention, it is quite apparent that the device is substantially identical with the rst described embodiment with the exception of the means of connecting the guiding cylinder with the sleeve member.

As clearly shown in FIG. 3, the bottom member 6 of the guiding cylinder 6 is downwardly tapered and the sleeve member "11 has a complementary inner tape, so that the sleeve member is mounted on the bottom member 6"3 by means of a press seat.

FIGS. 4 and 5 disclose quite clearly the connection of the sleeve member 11' with the tool 5. The edge portions of the sleeve member 11'are equipped with inclined engagement Afaces l112 and with bores '113 leading from the faces 112 to the bottom face 1&14 of the sleeve member 11' and receiving screw bolts '14 which project from the tool 5 through and beyond the bores 113, to receive nuts 1S, which secure thus the tool 5 to the sleeve member 151.

The same securing means between the sleeve member 11 and the tool 5 are also applied to the embodiment disclosed in FIGS. 1 and 2.

Sealing members l13 are disposed between the inner guiding cylinder 6 and the outer cylinder 4 forming the housing for the working device, which sealing members 13 function as dirt-deterring means.

While I have disclosed several embodiments of the present invention, it is to be understood that these embodiments are given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

1. A swing system for a motor-driven manually-guided working device including a reciprocating tool, comprising a driving motor operatively connected with said Working device, said driving motor having a shaft, the latter carrying a pinion, a gear meshingiwith said pinion, a crank drive operated by said gear and including a connecting rod, said crank drive transmitting the driving force to said swing system, a first, outer cylinder forming a. housing for said Working device, a second, guiding cylinder coaxially disposed in said lirst cylinder and movable axially in the latter, a tool connected to and movable with .said guiding cylinder, a piston reciprocating in said guiding cylinder and having a piston rod, the free end of said piston rod being pivotally connected with the free end of said connecting rod, and a spring disposed on each side of said piston and each of said springs engaging one face of said piston and the corresponding opposite inner end face of said guiding cylinder, so that said second guiding cylinder reciprocates jointly with said tool in axial movements by following the forced reciprocating movement of said piston by the intermediary of said springs, the strokes of said guiding cylinder being of greater axial length than those of said piston.

2. The swing system, as set lforth in claim l, wherein said rst, outer cylinder and said second, inner guiding cylinder dene an annular space therebetween, and packing means disposed in said annular space at the lower end thereof, in order to provide a sealing between said cylinders, said packing means to operate as dirt-deterring means.

References Cited in the fiile of this patent UNITED STATES PATENTS 769,943 Embleton Sept. 13, 1904 2,318,315 Johnston May 4, 1943 2,845,050 Wacker et al July 29, 1958 2,942,589 Wacker June 28, 1960 2,944,523 Werstein July 12, 1960 FOREIGN PATENTS 358,793 Germany Sept. 16, 1922 166,995 Austria Oct. 25, 1950 877,278 Germany May 21, 1953 

1. A SWING SYSTEM FOR A MOTOR-DRIVEN MANUALLY-GUIDED WORKING DEVICE INCLUDING A RECIPROCATING TOOL, COMPRISING A DRIVING MOTOR OPERATIVELY CONNECTED WITH SAID WORKING DEVICE, SAID DRIVING MOTOR HAVING A SHAFT, THE LATTER CARRYING A PINION, A GEAR MESHING WITH SAID PINION, A CRANK DRIVE OPERATED BY SAID GEAR AND INCLUDING A CONNECTING ROD, SAID CRANK DRIVE TRANSMITTING THE DRIVING FORCE TO SAID SWING SYSTEM, A FIRST, OUTER CYLINDER FORMING A HOUSING FOR SAID WORKING DEVICE, A SECOND, GUIDING CYLINDER COAXIALLY DISPOSED IN SAID FIRST CYLINDER AND MOVABLE AXIALLY IN THE LATTER, A TOOL CONNECTED TO AND MOVABLE WITH SAID GUIDING CYLINDER, A PISTON RECIPROCATING IN SAID GUIDING CYLINDER AND HAVING A PISTON ROD, THE FREE END OF SAID 